There's also a way to get this sort of chart with one step. You can
hit Alt-N; or you can go into "Settings... Toolbar" and toggle the
"'Full horizon' view" button. Clicking on that button, or hitting Alt-N,
will cause you to go to a 180-degree field of view, centered on the zenith,
with the horizon stretched around the field as a circle... basically, the
same sort of chart you see in the center pages of _Sky & Telescope_ or
_Astronomy_.

As Philippe mentioned, you can go to "Display... Background" and turn
on the 'filled horizon' check-box. I deliberately made the horizon semi-
transparent, because it can be convenient to see what objects are about
to rise or have just set. Still, I agree that there are situations where
this behavior isn't convenient.

Incidentally, I've found that some people find charts of this sort to
be confusing, what with the horizon being projected into a circle. It
can help if, as long as you're in "Display... Background", you set the
"Horizon objects" check-box. The horizon will then be lined with a few
objects (houses, cars, trees, telescopes, etc.) that make the layout
a bit more obvious. (The charts in the center of _Sky & Telescope_ use
a similar trick.)

Those wishing to customize the horizon objects should take a look at
the comments at the end of HORIZON.DAT.

It just occurred to me that Roger might be looking, not for a hemisphere
view, but a truly full-sky view that shows both hemispheres. For some
comments as to why I like that idea, but haven't done it yet (and probably
won't anytime soon),

http://www.projectpluto.com/future.htm#projections

-- Bill